Here are the results of yesterday’s dyno session.

This is a 6.54L sleeved stroker motor, 8.5:1 CR, supercharged, running 18 psi of plenum pressure.

All numbers at wheel, of course.
At engine, looks like 900 HP and 824 lb ft of Torque.
(I have added nothing for being measured on an eddy-current dyno)

I am very pleased with intake runner length and the camshaft timing now.
For road racing, we have a nice flat, broad torque band – the power is “on “from 4200 to 5800 rpm.
For Bonneville, on the other hand, I need peak HP to be at peak RPM. You can see we hit that too.

This chart only goes to 6200 rpm, but when I went to 6800 there was no significant HP drop-off.

These numbers are being produced with Bonneville spec gas (116 octane) and boost. Nothing else. No Snow spray, water-meth, or additives of any kind. Gas and air – that’s it.

We left about 10 HP on the table - there was a little more to be had with another degree of ignition timing but we thought it too close to the ragged edge, so we left it out.


If you have not been following the evolution of this engine and development of the sub-systems, here are some points along the way:

We needed to develop heads with huge flow numbers for this engine. That was completed in March 2009 and discussed here:
https://rennlist.com/forums/928-foru...rovements.html


We needed our own intake manifold port-matched to the new heads and with runner lengths to put the HP and Torque in the power band where we wanted it. That was completed in July 2010 and discussed here:
https://rennlist.com/forums/928-foru...32v-928-a.html


On the other side of those monster heads, we needed port-matched headers.
Finished and discussed in December 2009 here:
https://rennlist.com/forums/928-foru...available.html

..and we needed to find a replacement valve and spring combo that could tolerate our high lift and 7000 rpm cycle rate:
https://rennlist.com/forums/928-foru...le-report.html

Also required was a new crank scraper system to fit around the stroker crank, new fuel rails to flow more fuel, the engine management system, beefy con rods, and more. Its been quite a build, lasting over two years.

I am still using the oil separator and crankcase evacuation system that I last ran on the 5.1L 16v supercharged motor (Pikes Peak engine), and it is inadequate for this motor. So my next task is to develop a new evacuation system with the capacity to handle this motor at WOT for 1 minute 15 seconds at redline (Bonneville). That’s what I am working on next.

 

Wow, that's a mighty pretty dyno chart.

I need to go through your other threads for a refresh before I ask a bunch of redundant questions

 

Nice Numbers Carl.

Is that a raptor super charger.
I never checked the threads yet so ILL ask what kind of boost did it take to get those numbers, Besides the other mods

BTW how come you sent me Black wires and not those nice red ones with my Tec GT

 

damm..... do you have any video...I'd love to hear it!!!

 

I take back every comment Hacker ever made about your incredibly small *****. I'd say you've over compensated.

 

Wait a minute... this is a 32V motor. Obviously you're not running the stock ignition system - so what are you using?

Also, I better ask before someone else does... How are you dealing with all that oil packing the heads?

 

I think he uses the electromotive Tech GT system he sells......

Running WOT for 1:15 will stress the motor for sure!!!

 

Carl You never cease to amaze me! Your love for these cars, your knowledge and the products you have brought to the table is nothing short of amazing!

 

That engine looks awesome!!

 

We're waiting to hear that bad boy on the dyno.

 

This was on a chassis dyno, not a engine dyno, not going to be able to load it up like you can on a engine dyno.

Very impressive numbers though.

 

Hey AO, your new Avatar is fab.

 

Question of the day, these days........


Looking pretty in Pink there AO!

Great work Carl...let us know when you go to B'ville!

 

Is this an automatic?

 

Jaysus. That's some real horsepower.

Is that a stock tranny. I thought they would blow to pieces with that kind of torque.